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helloCrystal

I am wondering if there is a more “mathematical” definition of left edge. In the diagram shown, I am having a hard time identifying left edges.

wdc

Is there a reason the top and left edges are chosen instead of the bottom and right edges?

RyuK

The rightmost two triangles(both of which are a combination of two adjacent triangles) are equivalent to a single triangle on the screen, are specifically formulated to remove such types of adjacent triangles?